Paint & Color

Paint Cost Calculator

Forecast paint spend from surface area, coverage, coats, pack size, and local price.

Paint planning worksheet

Set the surface and paint assumptions for Paint Cost Calculator

Method for this tool

What the Paint Cost Calculator actually calculates

Paint volume is area times coats divided by coverage. The tool rounds that volume up to whole cans of the single size entered, then adds extras. There is no automatic waste allowance, mixed-can optimization, labor charge, or tax calculation.

The calculation path

The required paint volume is rounded up to whole cans before primer and supply costs are added.

Inputs that can change the answer

Paintable area: Enter paintable area in m².
Coverage per litre: Use the coverage per litre printed for the selected paint and surface, not the wall area.
Coats: Enter coats as a number; use the definition in the calculation method.
Can size: Litres in one available can. This tool rounds purchases to this single can size.
Price per can: Enter price per can in the selected currency; keep tax and included work consistent.
Primer and supplies: Enter primer and supplies in the selected currency; keep tax and included work consistent.
Currency: Label for all entered prices; no currency conversion is performed.

Checks that stay outside the formula

Compare cost per covered square metre, not simply cost per can.

A practical order for entering the data

Enter the net surface area to paint, excluding untreated openings.
Use the intended coat count and the product's coverage per litre.
Enter one can size, its price, and a combined allowance for primer and supplies to price whole cans.

Project walkthrough: From wall measurements to a paint shopping list

Project walkthrough: Choose a paint finish and test colour before buying

Engine check using the prefilled sample

Paint and colour example: paintable area = 42 m², coverage per litre = 10 m²/L, coats = 2, can size = 4 L, price per can = 45, primer and supplies = 25 and currency = USD ($). Use these numbers to follow the calculation, then substitute the dimensions, coverage, coats, or preferences that match your room.

Results for these inputs

Paint volume: 8.40 L
Whole cans: 3 cans
Estimated project cost: 160.00 USD

Project-specific method

Worked example and purchase checks

This calculator separates volume from purchasing. It first estimates litres from area, coats, and coverage. It then divides by one chosen can size and rounds upward to whole cans before adding the separate primer-and-supplies amount.

Illustrative worked example

Pricing a two-coat wall project with 3.78 L cans and a separate allowance for primer, tape, and rollers.

Exact inputs for this example

Paintable area	38.4 m²
Coverage per litre	9.5 m²/L
Coats	2
Can size	3.78 L
Price per can	42
Primer and supplies	32
Currency	USD ($)

Paint volume: 8.08 L
Whole cans: 3 cans
Estimated project cost: 158.00 USD

How to read the result

Watch the whole-can boundary. A small change in area or coverage can add an entire can. Compare the final can count against the sizes actually sold locally before treating the cost as a shopping total.

Assumptions this example makes

One can size and one price are used for the whole calculation.
The entered paintable area already reflects any openings or surface exclusions.
Primer and supplies are entered as a money amount, not calculated from surface area.

What this calculator does not prove

It does not optimize a mix of different can sizes.
Tax, labour, delivery, tint fees, discounts, and waste are not added unless you include them in the inputs yourself.

From measured area to purchase costSketch is explanatory, not to scale.

Net areaLitres neededWhole cansPaint + supplies

Mistakes that change this result

Entering gross wall area after already buying from a net-area estimate.
Rounding litres down before the whole-can calculation.
Putting labour into can price, which makes later comparisons difficult.